"There is really very little of Machiavelli's one can accept or use in the contemporary world. The one thing I find interesting in Machiavelli is his estimate of the prince's will. Interesting, but not such as to influence me. If you want to know who has influenced me most, I'll answer with two philosophers' names: Spinoza and Kant. Which makes it all the more peculiar that you choose to associate me with Machiavelli."

"The cool cynicism of Machiavelli's teaching is impressive. Not only does he recommend to princes absolute unscrupulousness; his advice is based on the assumption that all their subjects are gullible and guided solely by self-interest. Some have been shocked by the book's immorality; others have found its lack of humbug refreshing. Few, however, have been persuaded to admire the models held up by Machiavelli, such as Pope Alexander VI and his son Cesare Borgia."

"The jury is still out, but what Machiavelli described—either to recommend or subtly denounce it—was a diplomacy without conscience. It may look brilliant, but many who commented on Machiavelli noted that hidden in his works is the idea that a diplomacy totally separated from morality and conscience may achieve results occasionally but in most cases, and in the long run, would not work. …However we decide to read him, Machiavelli listed as the three features of effective diplomacy caution, art (meaning the mastery of a number of technical tools), and above all patience."

"If one desires to learn at one blow, to what degree of hideousness the fact can attain, viewed at the distance of centuries, let him look at Machiavelli. Machiavelli is not an evil genius, nor a demon, nor a miserable and cowardly writer; he is nothing but the fact. And he is not only the Italian fact; he is the European fact, the fact of the sixteenth century. He seems hideous, and so he is, in the presence of the moral idea of the nineteenth.."

"In attempting to teach the prince how to achieve, maintain, and expand power, Machiavelli made his fundamental and celebrated distinction between "the effective truth of things" and the "imaginary republics and monarchies that have never been seen nor have been known to exist." The implication was that moral and political philosophers had hitherto talked exclusively about the latter and had failed to provide guidance to the real world in which the prince must operate. This demand for a scientific, positive approach was extended only later from the prince to the individual, from the nature of the state to human nature. Machiavelli probably sensed that a realistic theory of the state required a knowledge of human nature, but his remarks on that subject, while invariably acute, are scattered and unsystematic."

"Perhaps the most influential book ever written on the characteristics of men in politics is The Prince, by the great Renaissance Italian Nicolo Machiavelli (1469-1527). Despite its enduring popularity, fascination, and authority it is extremely one-sided and unsystematic."

"Machiavelli's Discourses is full of examples of men who by exceptional boldness (and cunning) rescue situations which on any conventional view would be hopeless. Indeed, Machiavelli makes a "theory" out of all this in The Prince—that Fortune is female, and is most likely to fall in love with brave men."

"In Machiavelli, for instance, courage is the highest expression of man's virtù; and virtù is above all man's civic spirit, his disposition to be active for the common good, or, more specifically, for civic glory and greatness."

"For Machiavelli, courage is the highest expression of virtù, and virtù is the possession of whatever qualities are needed "to save the life and preserve the freedom of one's country.""

"Machiavelli is the first important political realist... The three essential tenets implicit in Machiavelli's doctrine are the foundation-stones of the realist philosophy. In the first place, history is a sequence of cause and effect, whose course can be analysed and understood by intellectual effort, but not (as the utopians believe) directed by "imagination". Secondly, theory does not (as the utopians assume) create practice, but practice theory. In Machiavelli's words, "good counsels, whencesoever they come, are born of the wisdom of the prince, and not the wisdom of the prince from good counsels". Thirdly, politics are not (as the utopians pretend) a function of ethics, but ethics of politics. Men "are kept honest by constraint". Machiavelli recognised the importance of morality, but thought that there could be no effective morality where there was no effective authority. Morality is the product of power. The extraordinary vigour and vitality of Machiavelli's challenge to orthodoxy may be attested by the fact that, more than four centuries after he wrote, the most conclusive way of discrediting a political opponent is still to describe him as a disciple of Machiavelli. Bacon was one of the first to praise him for "saying openly and without hypocrisy what men are in the habit of doing, not what they ought to do"."

"At a certain stage in my reading, I naturally met with the principal works of Machiavelli. They made a deep and lasting impression upon me, and shook my earlier faith. I derived from them not the most obvious teachings [...] but something else. Machiavelli was not a historicist: he thought it possible to restore something like the Roman Republic or Rome of the early Principate. He believed that to do this one needed a ruling class of brave, resourceful, intelligent, gifted men who knew how to seize opportunities and use them, and citizens who were adequately protected, patriotic, proud of their State, epitomes of manly, pagan virtues. [...] But Machiavelli also sets side by side with this the notion of Christian virtues – humility, acceptance of suffering, unworldliness, the hope of salvation in an afterlife – and he remarks that if, as he plainly himself favours, a State of a Roman type is to be established, these qualities will not promote it: those who live by the precepts of Christian morality are bound to be trampled on by the ruthless pursuit of power on the part of men who alone can re-create and dominate the republic which he wants to see. He does not condemn Christian virtues. He merely points out that the two moralities are incompatible, and he does not recognise an overarching criterion whereby we are enabled to decide the right life for men. The combination of virtù and Christian values is for him an impossibility. He simply leaves you to choose – he knows which he himself prefers. The idea that this planted in my mind was the realisation, which came as something of a shock, that not all the supreme values pursued by mankind now and in the past were necessarily compatible with one another. It undermined my earlier assumption, based on the philosophia perennis, that there could be no conflict between true ends, true answers to the central problems of life."

"What has been shown by Machiavelli, who is often (like Nietzsche) congratulated for tearing off hypocritical masks, brutally revealing the truth, and so on, is not that men profess one thing and do another (although no doubt he shows this too) but that when they assume that the two ideals are compatible, or perhaps are even one and the same ideal, and do not allow this assumption to be questioned, they are guilty of bad faith (as the existentialists call it, or of “false consciousness,” to use a Marxist formula) which their actual behavior exhibits. Machiavelli calls the bluff not just of official morality—the hypocrisies of ordinary life—but of one of the foundations of the central Western philosophical tradition, the belief in the ultimate compatibility of all genuine values. His own withers are unwrung. He has made his choice. He seems wholly unworried by, indeed scarcely aware of, parting company with traditional Western morality."

"When Machiavelli advises the Prince to carry out the Machiavellian scheme of action, he invests those actions with no sort of morality or beauty. For him morality remains what it is for everyone else, and does not cease to remain so because he observes (not without melancholy) that it is incompatible with politics. ... For him evil, even if it aids politics, still remains evil. The modern realists are the moralists of realism. For them, the act which makes the State strong is invested with a moral character by the fact that it does so, and this whatever the act may be. The evil which serves politics ceases to be evil and becomes good."

"We are much beholden to Machiavelli and others, that write what men do, and not what they ought to do. For it is not possible to join serpentine wisdom with the columbine innocency, except men know exactly all the conditions of the serpent; his baseness and going upon his belly, his volubility and lubricity, his envy and sting, and the rest; that is, all forms and natures of evil. For without this, virtue lieth open and unfenced. Nay, an honest man can do no good upon those that are wicked, to reclaim them, without the help of the knowledge of evil."